Bessel_k1

Bessel-k1-func

Definition:

evaluates an approximation to the modified Bessel function of the second kind, . The function is based on Chebyshev expansions.

For more information please review the s18adc function in the NAG document.

Parameters:

x (input, double)

The argument x of the function. Constraint: x> 0.0.

i1 (output, double)

Approximation of the modified Bessel function of the second kind.